/**
 * 
 */
package ch14;

//: ColorBoxes.java
//Using the Runnable interface
import java.awt.*;
import java.awt.event.*;

class CBox extends Canvas implements Runnable {
private Thread t;
private int pause;
private static final Color[] colors = { 
 Color.black, Color.blue, Color.cyan, 
 Color.darkGray, Color.gray, Color.green,
 Color.lightGray, Color.magenta, 
 Color.orange, Color.pink, Color.red, 
 Color.white, Color.yellow 
};
private Color cColor = newColor();
private static final Color newColor() {
 return colors[
   (int)(Math.random() * colors.length)
 ];
}
public void paint(Graphics  g) {
 g.setColor(cColor);
 Dimension s = getSize();
 g.fillRect(0, 0, s.width, s.height);
}
public CBox(int pause) {
 this.pause = pause;
 t = new Thread(this);
 t.start(); 
}
public void run() {
 while(true) {
   cColor = newColor();
   repaint();
   try {
     t.sleep(pause);
   } catch(InterruptedException e) {}
 } 
}
} 

public class ColorBoxes extends Frame {
public ColorBoxes(int pause, int grid) {
 setTitle("ColorBoxes");
 setLayout(new GridLayout(grid, grid));
 for (int i = 0; i < grid * grid; i++)
   add(new CBox(pause));
 addWindowListener(new WindowAdapter() {
   public void windowClosing(WindowEvent e) {
     System.exit(0);
   }
 });
}   
public static void main(String[] args) {
 int pause = 50;
 int grid = 8;
 if(args.length > 0) 
   pause = Integer.parseInt(args[0]);
 if(args.length > 1)
   grid = Integer.parseInt(args[1]);
 Frame f = new ColorBoxes(pause, grid);
 f.setSize(500, 400);
 f.setVisible(true);  
}
} ///:~